The front brake discs consist of an inner carrier, which is mounted to the wheel, and an outer rotor. Both parts must be changed together as a pair.
Remove the front wheel (sect. 7 - 1, Removal of the front wheel).
Undo the retaining screws (5) of the disc to the wheel, remove the disc (7) and, on its left side, slide out the phonic wheel (6).

Removal of the front brake system
Overhauling the front brake componentsChecking drive chain tension
Important
Have chain tension adjusted by a ducati dealer or
authorised service centre.
Make the rear wheel turn until you find the position where
chain is tightest.
Set the vehicle on the side stand. Push down the chain at the
point of measurement and release.
Measure the distance betwee ...
Reassembly of the crankcase halves
The crankcase halves must be in good condition and perfectly clean. The
mating surfaces must be perfectly flat and free
from burrs.
Overhauling the alternator-side crankcase half
The following parts must be present on the internal side of the crankcase
half:
Gearbox secondary shaft bearin ...
Separation of the crankcase halves
Use two screwdrivers to remove the circlip (29) from the timing belt
driveshaft shaft (30) on the clutch-side crankcase
half.
Note
Take care to avoid scoring the surface of the shaft while removing the
circlip.
Unscrew the crankcase half screws on the chain side.
Unscrew ...